Child care land has a fantastic science experiment using a white carnation and food coloring showing how flowers drink water all the way from the stems to the leaves.
Fun guerrilla has a similar experiment with roses and splits the stem into two.
Get the instructions here:
http://funguerilla.com/rainbow-roses-all-colors-in-one-rose/
Science sparks makes many different colors.
Get the instructions here:
http://www.science-sparks.com/2011/09/26/changing-colour-flowers-with-transpiration/
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